MaChemGuy Transition metal complex colours

Blue solution

Blue solution

[Cu(H₂O)₆]²⁺ and [Cr(H₂O)₆]²⁺

Very pale pink solution

[Mn(H₂O)₆]²⁺

Green solution

[Fe(H₂O)₆]²⁺, [Cr(H₂O)₆]³⁺ and [Cr(OH)₆]³⁻

Yellow solution

[Fe(H₂O)₆]³⁺, [CuCl₄]²⁻, [CrO₄]2-

Deep/Dark blue solution

[Cu(H₂O)₂(NH₃)₄]²⁺

Blue solid

[Cu(OH)₂(H₂O)₄]

Green solid

[Fe(OH)₂(H₂O)₄] and [Cr(OH)₃(H₂O)₃]

Orange/brown solid

[Fe(OH)₃(H₂O)₃]

Light brown/beige/pale pink solid

[Mn(OH)₂(H₂O)₄]

Purple solution

[Cr(NH₃)₆]³⁺, [MnO₄]⁻ , [Cr(H₂O)₆]³⁺